3. which of the following must occur in order for speciation to take place?

populations within a species must be re-productively isolated.
populations within a species must be geographically isolated.
populations within a species must be behaviorally isolated.
populations within a species must be temporally isolated

1. environmental factors, such as ph and temperature, can affect the function of an enzyme. a. true b. false 2. which of the following is an organic molecules (ex. vitamins) that an enzyme? a. coenzyme b. product c. active site d. substrate 3. how do enzymes effect the speed of a chemical reaction? a. they speed it up b. they slow it down c. they have no effect on the speed of a reaction 4. during a chemical reaction, an enzyme is used up so that it can only be used one time. a. true b. false 5. which of the following results from a chemical reaction that is catalyzed by an enzymes? a. active site b. product c. substrate d. coenzyme

All individuals have two alleles for a given trait. according to mendel's these alleles are passed down one each from both mother and father.

How can an organ, such as the lungs, work for multiple body systems?